The episode is expected to start filming next week, according to a source who spoke to The Sun on condition of anonymity. The source said she might be directing two episodes of the political thriller, which has been the formula used with other directors.

Barry Levinson and Tom Fontana, whose TV credits extend back to NBC’s “Homicide: Life on the Street” and HBO’s “Oz,” have been signed by the National Geographic Channel to do a miniseries on the last days of the American Embassy in Saigon.